本文件规定了用于与ISO/IEC 11179-3元数据注册中心（MDR）通信数据元素定义的消息交换框架。它定义了一组事务的消息语义、协议和绑定，允许与ISO/IEC 11179-3 MDR交换常用的数据元素元数据子集
本文档建立了以下数据元素消息交换互操作性规范:
-从符合选择标准的ISO/IEC 11179-3 MDR中检索数据元素列表
-从ISO/IEC 11179-3 MDR检索选定数据元素的元数据。

This document specifies the message exchange framework for communicating data element definitions with an ISO/IEC 11179-3 metadata registry (MDR). It defines message semantics, protocols and bindings for a set of transactions allowing the exchange of a commonly used subset of data element metadata with an ISO/IEC 11179-3 MDR.
This document establishes the following data element message exchange interoperability specifications:
- retrieving data element list from an ISO/IEC 11179-3 MDR matching the selection criteria;
- retrieving metadata of a selected data element from an ISO/IEC 11179-3 MDR.